test(vscode): add generateQRCode tests for data URL output and error on empty input

packages/kilo-vscode/tests/unit/qrcode.test.ts

@@ -0,0 +1,25 @@
+import { describe, it, expect } from "bun:test"
+import { generateQRCode } from "../../webview-ui/src/utils/qrcode"
+
+describe("generateQRCode", () => {
+  it("returns a data URL for a valid string", async () => {
+    const result = await generateQRCode("https://example.com")
+    expect(result).toMatch(/^data:image\/png;base64,/)
+  })
+
+  it("returns a non-empty base64 payload", async () => {
+    const result = await generateQRCode("hello")
+    const base64 = result.replace("data:image/png;base64,", "")
+    expect(base64.length).toBeGreaterThan(0)
+  })
+
+  it("produces different outputs for different inputs", async () => {
+    const a = await generateQRCode("https://example.com/a")
+    const b = await generateQRCode("https://example.com/b")
+    expect(a).not.toBe(b)
+  })
+
+  it("throws on empty string", async () => {
+    expect(generateQRCode("")).rejects.toThrow()
+  })
+})